Tuesday, December10, 2019
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Marine Weather and Tides
Bloomfield, CA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:15AMSunset 4:51PM Tuesday December 10, 2019 9:00 AM PST (17:00 UTC) Moonrise 4:05PMMoonset 5:36AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ540 Coastal Waters From Point Arena To Point Reyes California Out To 10 Nm- 810 Am Pst Tue Dec 10 2019
Today..SE winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft at 15 seconds and S around 2 ft at 16 seconds. A chance of rain this afternoon.
Tonight..SE winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 6 to 8 ft at 15 seconds and S around 2 ft at 15 seconds. A chance of rain.
Wed..SE winds 10 to 15 kt. Wind waves 2 to 3 ft. W swell 7 to 8 ft at 15 seconds and S around 2 ft at 15 seconds. A slight chance of rain.
Wed night..SE winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft at 16 seconds. A chance of rain.
Thu..SE winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 9 to 11 ft at 19 seconds. A chance of rain.
Thu night..S winds up to 10 kt. Wind waves 1 ft. W swell 13 to 15 ft at 17 seconds. A chance of rain.
Fri..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 12 to 14 ft. A chance of rain.
Sat..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 8 to 10 ft. A chance of rain.
PZZ500 810 Am Pst Tue Dec 10 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A weak cold front will turn winds southerly today and bring a chance of showers this evening and into Wednesday. Light to moderate southerly winds will then continue through much of the week before shifting back out of the northwest towards the weekend. Moderate northwest swell will also persist before a longer period northwest swell arrives on Thursday. Wave heights will gradually build heading into the coming weekend creating hazardous seas conditions, particularly for smaller vessels.


7 Day Forecast for Marine Location Near Bloomfield, CA
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location: 38.36, -122.86     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 101138 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 338 AM PST Tue Dec 10 2019

SYNOPSIS. Dry conditions with mild temperatures are forecast through most of today. A weak weather system will likely produce light rain from late today into early Wednesday, mainly in the San Francisco Bay Area. Rain chances will continue in the North Bay through much of the remainder of the week, although any rain that falls is expected to be light. Generally dry weather is forecast for areas south of the Golden Gate from Wednesday through Friday. Rain chances will become more widespread on Saturday before dry weather returns Sunday and Monday.

DISCUSSION. As of 3:10 AM PST Tuesday . A band of thick high clouds has spread over our forecast area overnight, reducing outgoing longwave radiation. This is not only helping to keep overnight temperatures somewhat elevated, but also inhibiting fog formation. Surface relative humidity values are anywhere from 5 to 15 percent drier than 24 hours ago and fog is currently absent in most areas. Present conditions are much different than early yesterday morning when areas of dense fog had formed. High clouds are expected to persist for the remainder of the night and so any fog that does develop by daybreak is likely to remain patchy.

Less low level moisture this morning will mean earlier clearing of patchy low clouds today. Also, high clouds are expected to diminish by this afternoon. More sun today should mean slightly warmer temperatures than yesterday.

Early morning satellite imagery shows a system approaching from the west out near 130W. Although this system is relatively weak, it has tapped into a relatively moist airmass from the southwest with precipitable water values as high as 1.4 inches. So, although models indicate weakening as the system moves inland over California, there should be sufficient moisture to produce at least light rain across much of the SF Bay Area from late this afternoon through tonight. A few showers may linger into Wednesday morning. Rain totals through Wednesday morning are forecast to be less than a quarter inch, except locally up to a third of an inch in the coastal hills of Sonoma County. Winds are not expected to be a factor with this system, with wind gusts of only about 20 mph forecast along the coast overnight.

Once the incoming system passes tonight, the models agree that a moist zonal flow will develop across the Eastern Pacific and into the Pacific Northwest and far northern California. Weak impulses moving through this moist zonal flow may generate light rain as far south as the North Bay from time to time from late Wednesday through Friday night. A shortwave trough moving in from the northwest late in the week may then generate more widespread rainfall across our area on Saturday. However, the models have been backing off on precipitation potential on Saturday, and where rain does fall, amounts are expected to be light. Rainfall totals for the entire week, from late today through Saturday, are forecast to be a quarter of an inch of less from San Francisco southward . and from 0.25 to 1" in the North Bay. Onshore flow through the week will maintain seasonable daytime temperatures and mild nighttime temps.

Dry weather is expected to return to the entire forecast area on Sunday and Monday. Longer range models maintain a progressive pattern into next week, with at least two systems potentially impacting our area. The systems next week, while not currently expected to be overly strong or wet, at least appear likely to generate more widespread and significant rainfall than what is forecast this week.

AVIATION. as of 03:38 AM PST Tuesday . For 12z TAFs. Much of the stratus over the region last evening has cleared out as high clouds move overhead, but patches remain based on current observations. High clouds obstructing the view of the surface on satellite making it difficult to discern the extent of the remaining stratus. Obs show conditions ranging from VFR to IFR with cigs between 800 ft and 2500 ft AGL. Expect patchy low clouds to continue this morning creating occasional MVFR/IFR conditions. Patches of fog may also develop once the high clouds move out, although satellite does show another set of higher clouds just behind this current one. Depending on how things unfold, tafs may need to be amended should fog develop. Low confidence this morning on cigs/vis. Clouds expected to lift this afternoon with mid/high level clouds continuing ahead of the next system. Cigs will lower again this evening as showers move in from north to south. Generally light winds expected through the period at or less than 10 kt. Winds to turn southerly by this evening ahead of the front.

Vicinity of KSFO . Intermittent VFR/MVFR conditions due to low clouds at around 1500 to 2500 ft along with higher clouds. It is possible that the stratus will expand further once the high clouds have moved out, however, satellite does show another set of higher clouds after a brief gap. Patchy fog early this morning is also a possibility. Low confidence forecast for vis/cigs. Guidance suggests cigs will lift this afternoon with mid/high level clouds continuing ahead of the next system. High res models show light showers arriving at around 02z-04z this evening. Expect cigs to also lower once again by tonight. Light winds this morning becoming NW this afternoon and turning southerly this evening.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . High clouds obstructing view of surface conditions around the Peninsula. Obs show less extensive stratus than was seen last evening. Patchy low clouds and fog still possible this morning before lifting in the afternoon. Cigs will lower again this evening and overnight as a weak frontal system approaches. Generally light SE winds this morning to turn onshore this afternoon.

MARINE. As of 2:08 AM PST Tuesday . Generally light winds will persist over the coastal waters as a weak system approaches. A weak cold front will turn winds southerly today and bring a chance of showers this evening and into Wednesday. Light to moderate southerly winds will then continue through much of the week before shifting back out of the northwest towards the weekend. Moderate northwest swell will also persist before a longer period northwest swell arrives on Thursday. Wave heights will gradually build heading into the coming weekend creating hazardous seas conditions, particularly for smaller vessels.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: Dykema AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 25 mi30 min E 9.7 G 14 51°F 55°F1024.2 hPa47°F
PRYC1 - 9415020 - Point Reyes, CA 26 mi48 min 54°F1023.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 38 mi42 min E 5.1 G 6 51°F 1024.6 hPa
RCMC1 - 9414863 - Richmond, CA 38 mi42 min 54°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 39 mi25 min N 5.1 51°F 1025 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 41 mi42 min NNE 2.9 G 4.1 53°F 1024.9 hPa
46237 - San Francisco Bar, CA (142) 41 mi60 min 54°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 42 mi20 min ENE 9.7 G 12 53°F 56°F1024.5 hPa
46214 - Point Reyes, CA (029) 43 mi30 min 56°F4 ft
FTPC1 - 9414290 - San Francisco, CA 44 mi48 min N 8 G 8.9 52°F 54°F1024.7 hPa
UPBC1 45 mi42 min E 4.1 G 6
MZXC1 - 9415102 - Martinez-Amorco CA 45 mi48 min ENE 1 G 2.9 50°F 54°F1025.2 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 46 mi42 min N 4.1 G 5.1 52°F 1023.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 46 mi75 min NNE 1 47°F 1025 hPa
OBXC1 47 mi42 min 53°F 51°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi48 min E 5.1 G 6 53°F 1024.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 48 mi42 min 53°F

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA11 mi67 minESE 510.00 miMostly Cloudy49°F46°F93%1023.9 hPa
Petaluma Municipal Airport, CA15 mi65 minN 010.00 miOvercast48°F48°F100%1025.1 hPa
Novato / Gnoss Field, CA22 mi65 minN 010.00 miOvercast50°F50°F100%1025.1 hPa

Link to 5 minute data for KSTS

Wind History from STS (wind in knots)
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Last 24hrCalmSW3S3SE4E4CalmCalmCalmN4NW3CalmCalmW3N5E4CalmCalmE4E6CalmCalmCalmSE5SE4
1 day agoSW3SE3Calm4W4CalmNW3CalmCalmCalmCalmCalmW3CalmCalmCalmCalmNW3N4CalmCalmCalmCalmN3
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S5S7S10S6S6S6SW3S4S3S5SE4SE3SE4CalmCalmCalmS3SE4

Tide / Current Tables for Bodega Harbor entrance, California
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Bodega Harbor entrance
Click for Map
Tue -- 03:05 AM PST     2.50 feet Low Tide
Tue -- 05:37 AM PST     Moonset
Tue -- 07:18 AM PST     Sunrise
Tue -- 08:58 AM PST     5.98 feet High Tide
Tue -- 04:05 PM PST     Moonrise
Tue -- 04:08 PM PST     -0.28 feet Low Tide
Tue -- 04:51 PM PST     Sunset
Tue -- 10:51 PM PST     4.36 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.73.12.72.52.73.34.255.765.74.93.62.20.90.1-0.3-0.10.61.52.63.54.24.4

Tide / Current Tables for Tomales Bay Entrance, California
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Tomales Bay Entrance
Click for Map
Tue -- 03:24 AM PST     2.22 feet Low Tide
Tue -- 05:36 AM PST     Moonset
Tue -- 07:17 AM PST     Sunrise
Tue -- 09:27 AM PST     5.50 feet High Tide
Tue -- 04:05 PM PST     Moonrise
Tue -- 04:46 PM PST     -0.41 feet Low Tide
Tue -- 04:51 PM PST     Sunset
Tue -- 11:18 PM PST     3.80 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.42.92.52.22.32.73.44.255.45.44.93.92.71.50.4-0.2-0.4-00.81.82.83.53.8

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (12,3,4,5)
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Ground Weather Radar Station Sacramento, CA
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.